The device releases the switch to the 'OFF'-position at voltage failure or undervoltage (below 70% nominal voltage).
During the magnetic system is not energized, the switch-contacts are spring-returned but can be closed by switching to the 'ON'-position.

The device releases the switch to the 'OFF'-position at voltage failure or undervoltage (below 70% nominal voltage).
During the magnetic system is not energized, the handle is spring-returned but the switch-contacts can't be closed.